It's probably a blown speaker coil, you would have problems with the bike running bad if the charging system was below 13+ volts when riding. It might be a bad ground wire or loose speaker wire, but with my experience being a musician for 40 years, speakers sometimes crap out! Improper ohm balance or pairing will burn out the voice coil and make them sound like a kazoo!
Just my opinion.
2011 FLTRU Fullsac Sportpipe, SE Breather/air cleaner, SEPRT Smart-tune, Corbin, Madstad 13", Gold Top Fork Emulators & Springs & JRI B shocks. 2003 XLHS
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